Mold.



J. B. BLAW.

MOLD.

APPLICATION FILED MAR. 17, 190s.

Patented Aug. 31, 1909 2 SHEETS-SHEBT 1.

Patented-Aug. 31, 1909.

z SHEETS-SHEET 2.

l mvEN'roR J. B. BLAW.

i MOLD.

APPLICATION FILED MAR. 17, 1908.

WITNESSES UNITED* srarss Parana onirica;

JACOB B. BLAW, OF PITTSBURG, PENNSYLVANVIAjASSIGNGB TOIBLAWfCOLLAPSIBLE STEEL CEN-f TERING COMPANY, 0F PITTSBUBG, PENNSYLVANIA, A CORPORATIGN" 0F NEW JERSEY;

MGLD'.

Semoir.

To ,all whom, may concern:

lie it` known that i, dacci; B. Bmw, a citizen of the `United States, residing at- Pitts-- duits and similar passages, and has for itsv principal objects; the provision of an improved type of framework especially suitable for molds of large diameter and one wherein the thin shellI is properly supported with a framework of minimum weight; and the provision of a rigid mold framework which may be conveniently and readily collapsed to permit the freeing of the shell of the mold from the concrete. One embodiment ot' the invention is illustrated in the drawings, wherein Y ltigure l is an end View of the mold,

Figure 2 is a longitudinal section on the line H-II of Figure l,

Figure 3 is a partial transverse section through the mold,

Figure 4 is an enlarged detail view showing the manner of attaching the securing orackets,

Figure 5 is an enlarged detail lsection illustrating the manner of shells together, and

Figure 6 is an end view of the securing means shown in Figure 5.

The form of moldshown and hereinafter described is intended primarily for the formation of large concrete sewers or passages, and the invention 'resides particularly in the forni of supporting framework, whereby a rigid mold fornris secured, and which permits at the saine time the use of light sheet metal as the outer surface or shell of the mold, to the end that a very large mold may me made suiiioiently light to be easily handled and moved from one position to anotheihon the rollers or wheels shown. Brieiiy stated the invention consists in making the mold in two parts or shells secured togetherat. their upper edges, trusses or framework for rigidly supporting each' of the halves independently of the other halt, and means for inoving the lower portion 'of the mold sections toward and from each other a certain distance, so that the mold shell may be freed from the concrete after it has set.

specification of Leiters Patent V Patented Aug. Application filed March 17, 1908. SerialNo. I213716.

accompanying securing the two haltI The'sliell of the mold consists of the plates lhl secured to the circumferential stiften ing channels 2 and 3, (Fig. 2), which chanshown in Figs. 5 and 6 to be hereinafter described. The channels 2 are riveted to the plates, but the channels 3 are secured detach- Figure 2. As here shown the plates constituting the shellcoine. together or abut at the backs of the channels and are provided at a short distance back from the edges with the angles 5, which are riveted to the plates. These angles 5 are detachably secured to the ianges of the channels by means of the bolts secured together along their horizontal edgesI by meansl oil thc angles 7 shown in ligure 3, 'which angles aie'riveted to the edges ot' the plates l and are secured toget] ier by means ot' bolts 8. The two halves lwhich constitute the mold are secured t0- getlicr along the upper center line of the mold in the manner indicated in Figures 5 and 6. As here shown each of the channels 2 and 8 is provided with a securing angle or bracket` 9, which bracket opposes a simillar bracket upon the opposing channel as indicated in dotted lines in Figure 5. A liner plate 10 extending the length of theniold section is interposed between the iianges of the two angles 9-9 and these parts are secured together detachably b means of transverse bolts. Each half of the mold is braced and supported by means otl a truss construction including the inclined angles ll, the horizontal angles l2, and the plurality of transverse braces 13, lll, l5, 16 and 17. lThe opposing inclined angles ll are braced and supported upon each other by means of the braces 18, which are preferably of wood and are each provided at the end with a turnbucklel9 for "expanding the shell to its proper position ,andsubsequentiy contractingit to free it from the concrete'aiiter such concrete has set. The ends of theserbraces 18 are detachably secured to the angles lLby nieans'joi bolts angles Ossecured to the angles. The inner endsof thetransverse Vbraces'l, 13, 14 l5, 1G and 17 are-secured toftheangles l1 by e means of the gusset. platesl in the manner ably to 'the shell by the means shown in e nels terminate at the upper central portion of the mold and are secured together at this 60 point by means of the securing members-- (5. The plates l constituting the shell are passing through such ends and through the independently shown, and the outer ends are secured to the shell by means of the gusset. plates 22, which gusset plates are secured to the inside of the a les 3 as indicated in Fig. 4, small angles 22 being riveted to the gusset plates and channels respectively. Brackets 23 are secured.A to the angles 12 for carrying the supporting wheels 24, while the I beams 25 carry the Wheels 26. The I beams extend longitudinally the lenoth of the mold and serve to materially stiften it. The angles 20 also extend the length of the mold and serve to tie the -various trusses together. It will be seen from the foregoing that each half of the mold is very rigidly and securely braced of the other side, and that the two sides may be moved a certain distance by means of the collapsing braces 1.8.

By the use of the truss arrangement with its transverse braces, and' because oi: the secure 4.lstiifening of the shell by means oit the angles 2 and 3, avery thin plating may be used and the total Weight of the mold be, made very much less than vvpuld be .the case if the bracing and stitfening were less secure and heavier vplates had to be used for the shell of the mold.

In operation the mold section is supported upon jacks with the Wheels 2t and 26 about six inches above the track upon which they are designed to run, and the turnbuckles 19 are operated to spread the two halves of the mold to their proper positions.

`Concrete is then applied over the mold section to the desired thickness and allowed to set. After the concrete has set7 the turnbuckles 19 are operated to bring the sides ot the mold inward and free it 'troni the concrete. Only a slight movement is necessary in order to secure this result as the Weight of the mold causes it to disengage itseltafter the shell. of the mold has been slightly loosened from the engagingl concrete. As each side of the mold is rigidly braced the point of yielding upon the contraction of the turn-buckles is the central longitudinal portion of the mold at which the angles 9 and f bers adaptedv either plates l0 arc employed. After the mold has been slightly contracted and has dropped by its own weight so that the wheels 2i rest upon the tracks provided therefor, the mold is moved to a new position and the operation.

repeated. y

Having thus described my invention and illustrated its use,

what l claim as new and desire to secure ,by Letters Patent is the fol- 1. A moldclontistmg of a pair of opposing substantially triangular truss members connected at their upper ends in such manner that the lower portions oiE the truss mein-A bers may be swung toward and troni each other about the connection, and each coinprising' inner, outer, and bottom members,V

sheet metal lagging plates secured to the outer members ot the trusses, transverse supporting means for. said outer members eX- tending to the inner members iiiteimediate the ends thereof, and a collapsing brace between the lower' portions of the Atruss memto maintain such members in their outer position or to draw them toward each other.

2. A mold consisting of a pair of opposi ing trusses supported by each other at their upper ends in such manner that the lower portions of the trusses may be swung toward rind Afrom each other, and each comprising an outer curved member, an inner member and a plurality of transverse stiiiening inembers between said inner and outer members and connected to said inner member intermediate the ends thereof, sheet metal lag'- gingl plates secured to the outer sides of the outer truss members and transverse means adjacent the lower ends ot said truss inem bers for supporting and collapsing the same.

In testimony whereof I have hereunto signed my name in the presence of the two subscribed witnesses.

JACOB' B. BLAV.

,lVitiiesses 1 Hanviii' L. Lnoiiimu; Anoiiwon'rrr MARTIN. 

